Do we know if the noun De' is countable ?

If we want to say "we obtained valuable informations" do we say {De' lo'laH wISuqpu'} or do we say {De'(mey) lo'laH DISuqpu'} ?

It has never been used countably. I would go with De' lo'laH wISuqpu'.

Kruge says De' yIlI', not  De' tIlI'.

De' lI' Sovlu'DI', not De' lI' luSovlu'DI'.

Vixis says De' wIHevtaH, not De' DIHevtaH.

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SuStel
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